Constant USER_COMP_FRAGMENT_PREFIX 

const USER_COMP_FRAGMENT_PREFIX: &str = r#"
@fragment
fn fs_main(in: VertexOutput) -> @location(0) vec4<f32> {
    // All MD2 bare-name bindings live at module scope (`var<private>` in
    // `MD2_PRIVATE_STATE_DECLS`) so lifted user-defined functions can read
    // them. Initialise from the per-invocation inputs and the uniform
    // struct here — WGSL `var<private>` has no static initialiser, so the
    // first thing every fragment thread does is seed its private state.
    uv = in.uv;
    uv_orig = in.uv;
    rad = length(uv - vec2<f32>(0.5)) * 1.4142135;
    ang = atan2(uv.y - 0.5, uv.x - 0.5);
    ret = textureSample(sampler_main_texture, sampler_main, uv).rgb;
    _md2_color = ret;

    texsize = uniforms.texsize;
    aspect = uniforms.aspect;
    time = uniforms.time;
    fps = uniforms.fps;
    frame = uniforms.frame;
    progress = uniforms.progress;
    bass = uniforms.bass;
    mid = uniforms.mid;
    treb = uniforms.treb;
    vol = uniforms.vol;
    bass_att = uniforms.bass_att;
    mid_att = uniforms.mid_att;
    treb_att = uniforms.treb_att;
    vol_att = uniforms.vol_att;
    rand_preset = uniforms.rand_preset;
    rand_frame = uniforms.rand_frame;
    slow_roam_cos = uniforms.slow_roam_cos;
    slow_roam_sin = uniforms.slow_roam_sin;
    roam_cos = uniforms.roam_cos;
    roam_sin = uniforms.roam_sin;
    blur1_min = uniforms.blur1_min;
    blur1_max = uniforms.blur1_max;
    blur2_min = uniforms.blur2_min;
    blur2_max = uniforms.blur2_max;
    blur3_min = uniforms.blur3_min;
    blur3_max = uniforms.blur3_max;
    // `hue_shader` is the per-frame RGB tint MD2 cycles through over time.
    // The engine writes a time-driven tri-phase oscillator into
    // `uniforms.hue_shader.xyz` each frame; here we just splice it in so
    // user shaders that multiply `ret * hue_shader` get the slow rainbow
    // rotation MD2 is tuned for.
    hue_shader = uniforms.hue_shader.xyz;
    g_fTexSize = uniforms.texsize;

    q1 = uniforms.q[0].x;
    q2 = uniforms.q[0].y;
    q3 = uniforms.q[0].z;
    q4 = uniforms.q[0].w;
    q5 = uniforms.q[1].x;
    q6 = uniforms.q[1].y;
    q7 = uniforms.q[1].z;
    q8 = uniforms.q[1].w;
    q9 = uniforms.q[2].x;
    q10 = uniforms.q[2].y;
    q11 = uniforms.q[2].z;
    q12 = uniforms.q[2].w;
    q13 = uniforms.q[3].x;
    q14 = uniforms.q[3].y;
    q15 = uniforms.q[3].z;
    q16 = uniforms.q[3].w;
    q17 = uniforms.q[4].x;
    q18 = uniforms.q[4].y;
    q19 = uniforms.q[4].z;
    q20 = uniforms.q[4].w;
    q21 = uniforms.q[5].x;
    q22 = uniforms.q[5].y;
    q23 = uniforms.q[5].z;
    q24 = uniforms.q[5].w;
    q25 = uniforms.q[6].x;
    q26 = uniforms.q[6].y;
    q27 = uniforms.q[6].z;
    q28 = uniforms.q[6].w;
    q29 = uniforms.q[7].x;
    q30 = uniforms.q[7].y;
    q31 = uniforms.q[7].z;
    q32 = uniforms.q[7].w;

    // ---- begin translated user body ----
"#;